package com.day17.java1;
//死锁的演示
class A{
    public synchronized void foo(B b){ //同步监视器：A类的对象：a
        System.out.println("当前线程名："+ Thread.currentThread().getName()
                            + "进入了A实例的foo方法");//①
        try{
            Thread.sleep(200);
        }catch (InterruptedException e){
            e.printStackTrace();
        }
        System.out.println("当前线程名："+ Thread.currentThread().getName()
                + "企图调用B实例的last方法");//③
        b.last();
    }
    public synchronized void last(){ //同步监视器：A类的对象：a
        System.out.println("进入了A类的last方法内部");
    }
}
class B{
    public synchronized void bar(A a){//同步监视器：b
        System.out.println("当前线程名："+ Thread.currentThread().getName()
                + "进入了B实例的bar方法");//②
        try{
            Thread.sleep(200);
        }catch (InterruptedException e){
            e.printStackTrace();
        }
        System.out.println("当前线程名："+ Thread.currentThread().getName()
                + "企图调用A实例的last方法");//④
        a.last();
    }
    public synchronized void last(){//同步监视器：b
        System.out.println("进入了B类的last方法内部");
    }
}
public class DeadLock implements Runnable{
    A a = new A();
    B b = new B();

    public void init(){
        Thread.currentThread().setName("主线程");
        //调用a对象的foo方法
        a.foo(b);
        System.out.println("进入了主线程之后");
    }
    @Override
    public void run() {
        Thread.currentThread().setName("副线程");
        //调用b对象的bar方法
        b.bar(a);
        System.out.println("进入了副线程之后");
    }

    public static void main(String[] args) {
        DeadLock d1 = new DeadLock();
        new Thread(d1).start();
        d1.init();
    }
}
